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Questions tagged [hvac]

(Heating, Ventilating, and Air Conditioning) For questions about installing, repairing, and troubleshooting HVAC systems.

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Two 40uf to equal 80uf capacitor for AC unit

BACKGROUND: I bought a place that has an older Armstrong Concept 1200; I know nothing about it other than the fact that the unit ran fine last year; winter came, and I disconnected the power for ...
Charlie's user avatar
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16 views

Attic flex run residential

Can I replace three 6” flex duct runs about 5ft long in two bedrooms, and one 10ft run on the third 3 bedroom (3 bedroom, 2 bath house). This is toward the opposite side of the fan end of the run. ...
Bruno's user avatar
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1 answer
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Can HRV be filtered on the outgoing side? Ducted?

JThis may be two questions, but they're both about HRV airflow so let's try it this way... I'm interested in eventually adding a Heat Recovery Ventilator (HRV) to my basement workshop, for fume ...
keshlam's user avatar
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How can I properly affix a plastic panel for an ACs exhaust pipe?

I have a portable AC unit in my office and I cannot figure out how to get the plastic panel that sits in the window and holds the exhaust pipe to stay put. I've tried lots of different kind of tape - ...
heabee's user avatar
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how should I mount this air handler?

I'm installing a new 3-ton heat pump and am trying to plan the crawlspace installation of the indoor unit (1200cfm air handler with heat strips) and its connection to the existing ductwork. These ...
RustyShackleford's user avatar
4 votes
3 answers
941 views

Water in attic AC air handler pan

The AC ran constantly for a day. Then next day air will not blow. I shut down the system. A lot of water poured into the pan under the air handler in attic. Somehow it overflowed. I collected at least ...
Maesumi's user avatar
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2 answers
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Blown AC Disconnect Fuses Different

I have two blown ac disconnect fuses. Are they supposed to be different? One is an Edison ECNR30 and the other is Fusetron FRN-R-35. My electric box amp that runs out to the ac is 30 amps. What ...
Bemo's user avatar
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1 vote
0 answers
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Radiant barrier to improve attic HVAC?

Does anyone have experience with adding a radiant barrier to the attic rafters to keep the attic HVAC cool in the summer? I've got a 2.5 ton unit that really struggles when the attic gets to 130F. ...
user1234057's user avatar
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Water heater, used to be external, and now internal, any concerns?

This question is about an external patio, which contained the water heater and furnace, in a utility closet off to the side. The idea is to close off the patio from the outside, turn it into a hallway,...
mgalpy's user avatar
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1 answer
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AC Condensate Drain Line - drain connection cleanout

See picture below for my AC drain line. When I bought the house the condensate drain line wasn't aligned with the in ground drain so I put that blue tubing on it to ensure all the condensation made it ...
Navy247 's user avatar
2 votes
1 answer
84 views

Need C-wire for new Honeywell RTH6500WF Thermostat

I am upgrading my old non-wifi programmable thermostats with Honeywell wifi models. These need a C-wire and my wiring only has 4 conductors and no C-wire (see image). I contacted Honeywell support and ...
NetGeni59's user avatar
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Correctly Calculating Air Condition Load for Service Calculation NEC 2014

I am looking to install all new kitchen appliances and wanted to see if my current service would be sufficient. I am trying to calculate the service load using Article 220 of the NEC 2014 and I am ...
GZ704's user avatar
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1 answer
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Could replacing capacitor have caused a leak in my whole house AC unit? [closed]

My 10-year old whole house AC unit has a leak. The capacitor was replaced 10 months ago. Could the act of replacing have caused the leak?
Gramma B's user avatar
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1 answer
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Connecting two pieces of AC drain line with vinyl tubing

I recently modified my drain line and ended up twisting it more than intended when gluing the PVC sections back together. As a result, my outdoor drain is no longer straight and looks unsightly. To ...
Chris's user avatar
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1 answer
102 views

WiFi Install no C Wire for thermostat or control panel

New home and trying to change old thermostat. New DIYer for electrical and HVAC. No C Wire however it does have 5 wires. RH, RC, Y, W, G. Attached is the schematic on the actual unit. I am unsure how ...
SArc00900's user avatar
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Outside unit won't engage

Friday night our AC quit working, the thermostats seem to be fine but when you initially turn it on "cool on" blinks for a little bit then goes away. Outside unit still doesn't engage. I've ...
Bryan's user avatar
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1 vote
2 answers
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Splicing dehumidifier drain line into AC drain lines

I recently added a dehumidifier in my crawl space and need to add a new line to deal with condensation water. My AC system has two drain lines, one primary and one secondary, both 3/4" in size. ...
Chris's user avatar
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4 answers
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Is it safe to run the AC for a extended time, when the condenser breaker is off?

In spring, we have very mild weather. Would it be safe to turn off the condenser breaker, and let the AC run, to just roll around the air in the house?
Nate's user avatar
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1 answer
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Best method to add a tee to AC drain line

I want to add a tee coupling to my existing AC drain line to accommodate the drainage of newly added dehumidifier condensation water. I did some research myself and debating between using a saddle tee ...
Chris's user avatar
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0 answers
15 views

Carrier thermostat upgrade

Looking to upgrade the old Carrier 2 stage thermostat with a new smart Honeywell T9 Smart Thermostat. The Carrier thermostat is a Comfort Zone 2 and has only 4 wires, V+, VG, RS+ ad RS-. Is there a ...
Al78's user avatar
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2 votes
2 answers
137 views

Understanding the concerns with vented to unvented retrofit of attic

I am working within a generally hot and humid location that might become quite cold, but only briefly in the winter (zone 3 below the humid line). I recently inherited an A-frame house that has blown ...
Atl LED's user avatar
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0 answers
40 views

Portable AC unit takes a long time before it finally starts blowing air

I have a portable AC unit in my room which has the issue of not starting or taking very long to start blowing air, let alone cold air. Once it finally starts blowing air however, it works fine and you ...
Max R's user avatar
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0 votes
1 answer
92 views

Why would multiple air conditioners fail?

I'm in an apartment with a wall mounted AC unit. Since I moved in months ago, I haven't had a working AC. I have had the AC unit replaced four times. Each replacement unit has had the exact same ...
nwsteg's user avatar
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furnance vent flue proper attachment

I had a code inspector let me know that my HVAC furnace flue is not properly attached. I have looked all over the internet and i think its a new code requirement in my area in the past few decades (...
gene tsai's user avatar
  • 101
3 votes
3 answers
465 views

In need of small HVAC duct solution

I am remodeling a basement bonus room; am adding a closet. The main ductwork was enclosed in a soffit. Due to the placement of the closet, I'm enclosing the soffit within the new closet header. The ...
user187622's user avatar
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0 answers
13 views

refill trap in drain for heat pump condensate

Bad smell in laundry room. We have a clear plastic condensate drain (D) from air handler (for heat pump) in attic. In the laundry room, D is visible in the wall opening that holds the water pipes for ...
Catherine's user avatar
  • 211
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1 answer
25 views

Home Preparation For Air Conditioner Installation

How can prepare myself for air conditioner installation when focusing on energy efficiency. Is there any anything i need to know? Please help me for Optimizing Energy Efficiency
kevinkemp's user avatar
0 votes
0 answers
58 views

Where should I install duct take-offs on a return plenum box?

I have a 5-ton system. My goal is to add an 8" return duct to a 15x9 guest room that has an 8" supply but no return air. When I went up to the attic to review my options, I saw that the ...
yayza's user avatar
  • 1
1 vote
1 answer
28 views

Who can diagnose and adjust automatic dampers?

I am trying to find the right person to diagnose and troubleshoot imbalanced zones and automatic dampers, but haven't been able to find anyone that seems experienced. Either the HVAC technicians seem ...
MonkeyBonkey's user avatar
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0 answers
23 views

Bonaire Durango Window Evaporative Swamp Cooler 4500E (2022) High speed only works. Last year all ok--Low, Med and High. Capacitor? Easy to replace?

Bonaire Durango Window Cooler 4500E (2022) High is only working speed, Last year was fine-Low, Medium and High. Capacitor? Easy to replace yourself? I just cleaned it and removed control knob when I ...
Mary Candace's user avatar
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53 views

The technician installed a new AC split without a vacuum pump

The technician installed a new AC split without a vacuum pump. (Gree 24000 BTU Inverter) Should we drain the refrigerant, do vacuum, and refill the refrigerant? It is written in the AC manual that we ...
Hadi's user avatar
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0 answers
32 views

Is there a standard formula or rule of thumb for how much airflow a whirlybird/turbine roof vent will achieve given a diameter and a wind speed?

I've been looking for effectiveness measures for whirlybird vents for a while and I can't find anything in building codes, and only one empirical claim from askthebuilder.com for a relationship ...
Steve's user avatar
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2 votes
1 answer
55 views

A/C works fine but when set to “cool” it makes a constant running noise even when it’s not blowing air

I just moved into a new place and I want to make sure if this issue can be normal before contacting my landlord because I am afraid I am making a mountain out of a molehill. Let me start out by saying ...
LaLoba's user avatar
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0 votes
2 answers
67 views

Honeywell Gas Control Valve Gas Smell

There was a gas smell coming from my Honeywell Gas Control Valve and I called the gas company out. They had a tool that they used SENSIT GOLD G2 that they used to check for gas leaks. On it, the ...
EndlessSummer86's user avatar
0 votes
1 answer
59 views

Will using the 10A port on meter to test transformer cause it to pop?

I was testing the transformer in my furnace across the COM and 120V terminals when it popped, sparked, and left a burn mark on the COM terminal. Could it be because this nucklehead had the positive ...
Em Duplessis's user avatar
2 votes
4 answers
688 views

Possibility of using a heat pump to exchange cool air from a ground floor with third floor room [duplicate]

Is it possible to create a heat pump system to exchange cool air from a ground floor bedroom with the heat from a third floor bedroom? I only know of heat pumps being used to exchange cool air & ...
DavidG's user avatar
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0 votes
1 answer
63 views

How can I balance capacity between two AC condensers?

New to HVAC and I want to be more confident in identifying linesets when dealing with two units. The house has two condensers with different tonnage and both supply different areas of the house ex: ...
Paul's user avatar
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0 votes
1 answer
53 views

is 5/8" sheet rock acceptable for a HVAC closet

Is 5/8" sheet rock suitable for a 4'x4'x4'x8'HVAC closet? Previous builder did not sheet rock behind a HVAC system in a residential home and homeowner not able to sell home.
Alex Bello's user avatar
1 vote
1 answer
45 views

Meaning of water droplets symbol on mini split?

Not sure what this symbol means on the right - “water droplets down lines” is the best I can describe it. You can see it on the middle right of the display on page 19 here, but it does not explain it. ...
KaPtain's user avatar
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0 votes
0 answers
26 views

Is an HVAC Reducing Elbow a Thing?

We're installing a Rheem Hybrid (heat pump & electric) hot water heater. The space where the heater goes is very tight and I need to use elbow on the cold air discharge as I come out of the heater....
dlu's user avatar
  • 508
1 vote
1 answer
37 views

Suction pipe freezing when blower is on low speed, and runs fine when blower turned to high speed!

I have 12000BTU unit running on R22, and I'm facing a strange issue with my split AC. When I run it with the indoor blower on low speed, the outdoor starts freezing on the suction pipe. But as soon as ...
omsharp's user avatar
  • 111
0 votes
0 answers
31 views

Furnace not Shutting Down Properly

I have a York Diamond 80 furnace with a newer main board. The furnace worked great all winter and just started having issues this morning. Here is what happens. I power the unit off for 20 seconds ...
Speeman's user avatar
0 votes
1 answer
59 views

How do I drill a hole in a brass register vent cover?

I recently bought a register vent cover, and it didn't come with pre-drilled holes. I'd like to see if I can just drill the holes myself. The product page says it's made of brass, and I've heard that ...
Heloise Sciamma's user avatar
0 votes
1 answer
81 views

How can I reduce temperature in a sunroom? [closed]

I have a room with 6 windows and a storm door. It was originally a "sun room" and now working from home, I have converted it into an office. I have 2 computers and 4 monitors so I know that ...
TarHeel's user avatar
1 vote
1 answer
62 views

AC is not working

My wall HVAC thermostat was loose on wall, so I made it tighter, but it was reported by my tenant that heater is working but AC is not working (not even kicking off). The AC breaker is on. One thing I ...
PowerTech's user avatar
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0 votes
1 answer
83 views

An HVAC technician spilled pvc primer in the attic while working. It stained and wet sheet rock. Will it dry? Or ruin sheet rock?

HVAC technician spilled pvc pipe primer on sheet rock ceiling. It caused a purple stain and wet halo. Will it dry? Or damage sheet rock?
Grace's user avatar
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0 votes
1 answer
43 views

Ventilation needs for heat pump water heater in outdoor utility closet

I am working with an HVAC contractor to replace my current gas-power water heater tank with a heat pump water heater. It will be located in an unconditioned utility closet with a door connected to the ...
Duncan Rager's user avatar
0 votes
0 answers
27 views

HVAC sensible and latent cooling numbers, calculator results versus equipment specs

Looking to size a new heat pump for my home, I've used two online calculators. They give pretty similar results. https://hvac.betterbuiltnw.com/ and https://www.loadcalc.net/ For cooling, the former ...
RustyShackleford's user avatar
0 votes
0 answers
15 views

high efficiency furnace 92% 120btu fresh air intake

Why is my goodman gm9s921205dn high efficiency furnace is having a strong suction through the fresh air intake 3"pvc causing flame to shut down the system, and shows error code EEO, then I remove ...
Jose's user avatar
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0 votes
0 answers
46 views

New Soffit Vent Design Still Bad Idea?

I recently discovered that my 1-story ranch (hip roof) has both full baths venting to attic. Upon this discovery I’ve been trying to determine best approach for venting to outside. I’d prefer to not ...
LakeHouse's user avatar

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